Portable form for concrete stairs



, Feb. 26, 1929. 1,703,633

R. NEWCOMB PORTABLE FORM FOR CONCRETE STAIRS Filed Feb. 17. 1928 Patented Feb. 26, 1929.

,um'rso STATES PATENTOFFICE."

mcnnn mzwooms, or 12mm, common.

PORTABLE FORM FOR CONCRETE STLIBSV Application filed February 17, 1928. Serial No. 255,003.

This invention relates to a metal form for mouldin concrete stairways and has for its principd objectthe provision of'a portable form which canbe quickly and easily set up for any desired stairway and can then be quickly and easily removed for use on sub sequent jobs.

Another object of the invention is to provide a concrete stairway form which will cast an ornamental nosing around the forward edge and extremities of the stair treads.

Still another object is to provide a form for concrete stairs which can be used for any de: sired number of steps without it being necessary to cut down the form.

A further object of the invention is to provide a stair form which will produce in concrete an ornamental stairway equal in appearance to the present metal stairs.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efiiciency. These will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a fragmentary perspective view of my improved stair form with two of the riser plates in place.

Fig. 2 is a detailed side elevation of the stair form illustrating the moulding plates for forming the ornamental nosing on the tread extremities.

Fig. 3 is a vertical section through the stair form with the concrete in place therein.

Fig. 4 is a detail vertical section taken on the line 44, of Fig. 2.

5 is a detail perspective view illustrating the appearance of the finished stairway.

My improved form for concrete stairs comprises an outer stringer plate 10, and. an inner stringer platell. joined by means of riser plates 12. Atthe bottom, the-form is closed by means of a series of bottom plates 13 whlch are indented to form continuous channels 14 for the reception of supporting structural members 15.

In use,the two stringer-plates 10 and Ham set up to the platform or floor at which the stair is to be built as shown in Fig. 3. If the plates are longer than that of the desired stairs, they are allowed to project above the upper step as shown. Sufiicient riser plates 12 are bolted in place by means of bolts 16, which pass through openings'28 in the string erfilplates to provide the desired length of so t.

Concrete is now pouredbehind each riser plate until each step has been filled. The tops of the steps are leveled by means of a trowel, using the. top and bottom of the riser plates as gauges. The top riser plate aligns with the top of the floor or platform- After the concrete has set the bolts 16 and 17 are loosened and the riser plates removed. This frees the stringer plates and allows them to be easilyremoved for use on subsequent Jobs. The inner stringerplatgin installations where the stairway is against a wall,

carries no design or moulding so that it can be removed from between the cast stair and the wall. The width of the plate is relatively small so that the space left by its removal is concealed when the wall is plastered.

The outer riser plate 10 is provided with any desired ornamental moulding 18 which will casta similar moulding in the concrete of the stairs. The upper edge ofthe plate 10 is turned outwardly and downwardly as shown at 22. The riser plates 12 are also provided with a moulding 19 to cast an ornamental front ornosing on the stair treads. The extremities of the riser plates are flanged as shown at 20 to receive the bolts 16. The bottom edge of the riser. plates are turned outwardly and upwardly as shown at 21 so that they will not imbed themselves in the concrete of the'step.

In some installations where the side of the stairway is exposed to View, it may be desirable to carry the ornamental moulding 19 of the step fronts around the endsof the steps as shown in Fig. 5. This is provided for by forming openings 23 throughout the length of the stringer 10 which align with the top of each stair tread. Over these openings a moulding cap 24 may be bolted as shown at 25. The moulding cap 24 is formed with a contour similar to the riser plates 12. The concrete flows through the openings into the caps 24 to form an ornamental endupon the stair treads as shown at 26, Fig. 5.

If the ornamental tread ends are not required the openings 23 can be closed by means 7 of suitable flat plates held in place by the bolts 25.

Sufileient space is provided behas been described and illustrated herein,

it is desired to be understood thatthe same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the nvention, what I claim and desire secured by Letters Patent, is p 1 1. A form for casting concrete stairs comprising a pair of stringer plates; riser plates detachably connected between said stringer plates; bottom plates extending between said stringer plates; horizontally disposed,

stepped openings in one or" said stringer plates arranged to allow said concrete to flow throu h said strin er late and moulding caps adapted to be secured to said stringer plates adjacent-said openings so as to re ceive said concrete.

2. A form for casting concrete stairs comprising a pair of relatively long stringer plates adapted to be placed at an angle to the vertical, there being horizontally disosed, stepped openings formed in one of said stringer plates; riser plates detachably connected to and separating said stringer plates; bottom plates connecting said stringer plates and moulding caps secured opposite said openings on the outside of one of said stringer plates and adapted to cast a portion of said concrete through saidstringer plate.

3. A form for casting concrete stairs comprising; a pair of relatively long stringer plates adapted to be placed at an angle to the vertical, there being horizontally disposed, stepped openings formed in one of said stringer plates; riser plates detachably connected to and separating said stringer plates; bottom plates connecting. said stringer plates and pocket membersopposite said openings on the outside of one of said stringer plates and adapted to receive a portion of said concrete through said stringer plate, said riser plates having a forwardly projecting upper ed 'e' adapted to cast anosing on the stair steps, said openings having a contour to coincide with said upper edge, said pockets hav ing an outline similar to said upper edge so that said nosing will be continued around one extremity of the stair treads.

r. In a tornrior casting concrete stairs having stringer plates and laterally extend- 

